EP3928894A1 - Procédé de fabrication d'une ébauche et procédé de traitement ultérieur de l'ébauche en un segment de traitement - Google Patents

Procédé de fabrication d'une ébauche et procédé de traitement ultérieur de l'ébauche en un segment de traitement Download PDF

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Publication number
EP3928894A1
EP3928894A1 EP20181947.1A EP20181947A EP3928894A1 EP 3928894 A1 EP3928894 A1 EP 3928894A1 EP 20181947 A EP20181947 A EP 20181947A EP 3928894 A1 EP3928894 A1 EP 3928894A1
Authority
EP
European Patent Office
Prior art keywords
processing
green compact
matrix material
segment
material particles
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP20181947.1A
Other languages
German (de)
English (en)
Inventor
Thorsten Klein
Matthaeus Hoop
Thomas Britt
Jens Stracke
Steven Moseley
József SZABÓ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hilti AG
Original Assignee
Hilti AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hilti AG filed Critical Hilti AG
Priority to EP20181947.1A priority Critical patent/EP3928894A1/fr
Publication of EP3928894A1 publication Critical patent/EP3928894A1/fr
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/12—Both compacting and sintering
    • B22F3/14—Both compacting and sintering simultaneously
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
    • B22F7/08—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/0009—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for using moulds or presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
    • B24D5/063—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental with segments embedded in a matrix which is rubbed away during the grinding process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/12—Cut-off wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
    • B24D7/063—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental with segments embedded in a matrix which is rubbed away during the grinding process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/001—Cutting tools, earth boring or grinding tool other than table ware
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F2005/005—Article surface comprising protrusions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
    • B22F2998/10—Processes characterised by the sequence of their steps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D2203/00—Tool surfaces formed with a pattern
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D99/00—Subject matter not provided for in other groups of this subclass
    • B24D99/005—Segments of abrasive wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/041—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs with cylinder saws, e.g. trepanning; saw cylinders, e.g. having their cutting rim equipped with abrasive particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/12—Saw-blades or saw-discs specially adapted for working stone

Definitions

  • the present invention relates to a method for producing a green compact according to the preamble of claim 1 and a method for further processing a green compact into a processing segment according to the preamble of claim 4.
  • Machining tools such as core drill bits, saw blades, abrasive disks and abrasive cutting chains include machining segments that are attached to a tubular, disc or ring-shaped base body, the machining segments being connected to the base body by welding, soldering or gluing.
  • processing segments that are used for core drilling are referred to as drilling segments
  • processing segments that are used for sawing are referred to as sawing segments
  • processing segments that are used for ablation, as ablation segments and processing segments that are used for cut-off grinding are referred to as cutting segments .
  • Processing segments for core drill bits, saw blades, abrasive disks and abrasive cutting chains are made from a matrix material and hard material particles, whereby the hard material particles can be statistically distributed or are arranged according to a defined particle pattern in the matrix material.
  • the matrix material and the hard material particles are mixed, the mixture is poured into a suitable tool mold and processed into the machining segment.
  • a green compact is built up in layers from matrix material, in which the hard material particles are arranged according to the defined particle pattern.
  • the processing zone turns off a first matrix material and the neutral zone made up of a second matrix material that is different from the first matrix material and can be welded to the base body.
  • Processing tools which can be designed as a core drill bit, saw blade, abrasive disc or abrasive cutting chain and are intended for wet processing of concrete materials, are only suitable to a limited extent for dry processing of concrete materials.
  • an abrasive concrete slurry is created, which supports the processing process and leads to a self-sharpening of the processing segments during processing.
  • the matrix material is removed by the abrasive concrete slurry and new hard material particles are exposed.
  • no abrasive concrete slurry can form, which can support the machining process.
  • the hard material particles quickly become blunt and the processing rate drops. Due to the lack of concrete sludge, the matrix material wears out too slowly and hard material particles lying deeper cannot be exposed.
  • the European patent application EP 3 670 041 relates to a method for producing a machining segment from a first matrix material and first hard material particles, which are arranged according to a defined first particle pattern.
  • the method is characterized in that a green compact is produced in which the first hard material particles protrude from the first matrix material on the upper side.
  • the green compact is processed further with a special press die which has depressions in a pressing surface, the arrangement of the depressions corresponding to the defined first particle pattern of the first hard material particles.
  • the known method for producing a processing segment has the disadvantage that a special press die with depressions in the pressing surface is required for further processing the green compact to form the processing segment, which is used for compression or hot pressing.
  • a special press die is required for each defined first particle pattern according to which the first hard material particles are arranged.
  • the object of the present invention is to develop a method for producing a green compact for a processing segment, with which processing segments can be produced which have a protrusion of the hard material particles on the upper side.
  • Conventional tool components are to be used both in the production of the green compact and in the further processing of the green compact in the machining segment; the use of special tool components should be avoided.
  • the method for producing a green compact for a processing segment from a powdery or granular first matrix material and first hard material particles, which are arranged according to a defined particle pattern, is characterized according to the invention in that a powder or granular support material is applied to the first hard material particles, the Support material is different from the first matrix material and the first hard material particles are completely embedded in the support material on an upper side opposite the underside.
  • the method according to the invention for producing a green compact is characterized in that the green compacts are built up vertically, i.e. the direction of build runs perpendicular to the vertical direction between the bottom and top of the processing segment.
  • the protrusion of the first hard material particles on the upper side of the processing segments is produced with the aid of the powder or granular support material, the support material being different from the first matrix material.
  • Green compacts which are produced by means of the method according to the invention for producing a green compact, can be further processed by means of known methods for further processing the green compact into processing segments.
  • the known methods for further processing include compacting the green compact by cold pressing or hot pressing to form a compact, which is further processed by free-form sintering or hot pressing to form the processing segment, or the further processing of the green compact by free-form sintering or hot pressing to form a processing segment.
  • Green compacts are further processed under the influence of temperature by free-form sintering or hot pressing to form the finished processing segment, the sintering temperature of the first matrix material determining the temperature up to which the green compacts or compacts are heated Need to become.
  • the support material can retain its powdery or granular state during the further processing of the green compact into a processing segment (first variant) or support the sintering process as an infiltrate (second variant).
  • a support material is applied with a melting temperature that is higher than the sintering temperature of the first matrix material. If the melting temperature of the support material is higher than the sintering temperature of the first matrix material, the support material remains in its powdery or granular state when it is heated and can be easily removed from the finished processing segment after the sintering process.
  • a support material is applied with a melting temperature that is lower than the sintering temperature of the first matrix material. If the melting temperature of the support material is lower than the sintering temperature of the first matrix material, the support material changes its powdery or granular state when it is heated and liquefies before the first matrix material sintered.
  • the liquid support material can be distributed in the first matrix material and support the sintering process as an infiltrate.
  • the invention further relates to a method for further processing a green compact, which was produced using the method for producing a green compact, into a processing segment, which is connected with an underside to a base body of a processing tool.
  • the first hard material particles have a protrusion on the upper side with respect to the first matrix material.
  • the green compact is compressed into a compact under the action of pressure and the compact is then processed further to form a processing segment.
  • the green compact is compressed into a compact under the action of pressure between a first press die, which forms the lower side of the processing segment, and a second press die, which forms the upper side of the processing segment.
  • the compact is particularly preferably processed further to form the processing segment by free-form sintering or hot pressing. Since the first hard material particles in a green compact produced according to the invention are completely embedded in the powder or granular support material, a conventional second press die can be used during hot pressing to shape the top of the processing segment.
  • the green compact is further processed into a processing segment by free-form sintering or hot pressing. Since the first hard material particles in a green compact produced according to the invention are completely embedded in powder or granular support material, a conventional second press die can be used for hot pressing to shape the top of the processing segment.
  • FIGN. 1A , B show two variants of a machining tool designed as a core drill bit 10A, 10B.
  • Core drill bit 10A shown is hereinafter referred to as the first core drill bit and the one in FIG. 1B
  • the core drill bit 10B shown is referred to as the second core drill bit, and the first and second core drill bits 10A, 10B are summarized under the term "core drill bit”.
  • the first core drill bit 10A comprises a plurality of machining segments 11A, a tubular base body 12A and a tool holder 13A.
  • the machining segments 11A which are used for core drilling, are also referred to as drilling segments and the tubular base body 12A is also referred to as the drill shank.
  • the drill segments 11A are firmly connected to the drill shank 12A, for example by screwing, gluing, soldering or welding.
  • the second core drill bit 10B comprises an annular machining segment 11B , a tubular base body 12B and a tool holder 13B.
  • the annular machining segment 11B which is used for core drilling, is also referred to as a drill ring and the tubular base body 12B is also referred to as a drill shank.
  • the drill ring 11B is firmly connected to the drill shank 12B, for example by screwing, gluing, soldering or welding.
  • the core drilling bit 10A, 10B is connected to a core drilling device via the tool holder 13A, 13B and is driven by the core drilling device in a direction of rotation 14 about an axis of rotation 15 during drilling operation.
  • the core drill bit 10A, 10B is moved along a feed direction 16 into a workpiece to be machined, the feed direction 16 running parallel to the axis of rotation 15.
  • the core drill bit 10A, 10B produces a drill core and a borehole in the workpiece to be machined.
  • the drill shank 12A, 12B is in the exemplary embodiment FIGN. 1A , B formed in one piece and the drill segments 11A and the drill ring 11B are firmly connected to the drill shank 12A, 12B.
  • the drill shaft 12A, 12B can be constructed in two parts from a first drill shaft section and a second drill shaft section, the drill segments 11A or the drill ring 11B being firmly connected to the first drill shaft section and the tool holder 13A, 13B firmly connected to the second drill shaft section.
  • the first and second drill shaft sections are connected to one another via a releasable connecting device.
  • the releasable connecting device is, for example, a plug-in-turn connection, as in FIG EP 2 745 965 A1 or EP 2 745 966 A1 described, trained.
  • the design of the drill shaft as a one-piece or two-piece drill shaft has no influence on the structure of the drill segments 11A or the drill ring 11B.
  • FIGN. 2A , B show two variants of a machining tool designed as a saw blade 20A, 20B.
  • the saw blade 20A shown is hereinafter referred to as the first saw blade and the one in FIG FIG. 2 B
  • the saw blade 20B shown is referred to as the second saw blade, and the first and second saw blades 20A, 20B are summarized under the term "saw blade”.
  • the first saw blade 20A comprises several machining segments 21A, a disk-shaped base body 22A and a tool holder.
  • the processing segments 21A which are used for sawing, are also referred to as sawing segments and the disk-shaped base body 22A is also referred to as the main blade.
  • the saw segments 21A are firmly connected to the master blade 22A, for example by screwing, gluing, soldering or welding.
  • the second saw blade 20B comprises a plurality of machining segments 21B , an annular base body 22B and a tool holder.
  • the processing segments 21B that are used for sawing are also referred to as sawing segments and the ring-shaped base body 22B is also referred to as a ring.
  • the saw segments 21B are firmly connected to the ring 22B, for example by screwing, gluing, soldering or welding.
  • the saw blade 20A, 20B is connected to a saw via the tool holder and, when the saw is in operation, is driven by the saw in a direction of rotation 24 about an axis of rotation 25. During the rotation of the saw blade 20A, 20B about the axis of rotation 25, the saw blade 20A, 20B is moved along a feed direction, the feed direction running parallel to the longitudinal plane of the saw blade 20A, 20B. The saw blade 20A, 20B creates a saw slot in the workpiece to be machined.
  • FIG. 3 shows a machining tool designed as a removal disk 30 .
  • the removal disk 30 comprises several machining segments 31, a base body 32 and a tool holder.
  • the processing segments 31 which are used for the removal are also referred to as removal segments and the disk-shaped base body 32 is also referred to as a pot.
  • the removal segments 31 are firmly connected to the pot 32, for example by screwing, gluing, soldering or welding.
  • the removal disk 30 is connected to a tool device via the tool holder and, in the removal mode, is driven by the tool device in a direction of rotation 34 about an axis of rotation 35 .
  • the removal disk 30 is moved over a workpiece to be machined, the movement of the runs perpendicular to the axis of rotation 35.
  • the removal disk 30 removes the surface of the workpiece to be machined.
  • FIG. 4th shows a machining tool designed as an abrasive cutting chain 40.
  • the abrasive cutting chain 40 comprises several processing segments 41, several link-shaped base bodies 42 and several connecting links 43.
  • the processing segments 41 which are used for cut-off grinding, are also referred to as cut-off segments and the link-shaped base bodies 42 are also referred to as drive links.
  • the drive links 42 are connected via the connecting links 43.
  • the connecting links 43 are connected to the drive links 42 via rivet bolts.
  • the rivet bolts allow the drive links 42 to rotate relative to the connecting links 43 about an axis of rotation that runs through the center of the rivet bolts.
  • the machining segments 41 are firmly connected to the drive links 42, for example by screwing, gluing, soldering or welding.
  • the abrasive cutting chain 40 is connected to a tool device via a tool holder and, during operation, is driven in one direction of rotation by the tool device. During the rotation of the abrasive cutting chain 40, the abrasive cutting chain 40 is moved into a workpiece to be machined.
  • a processing segment 51 which has hard material particles protruding from the matrix material on its upper side, takes place with the aid of the method according to the invention for producing a green compact and the method for further processing the green compact into a processing segment.
  • a green compact 52 is produced, in a second stage the green compact 52 is compacted into a compact 53 and in a third stage the compact 53 is further processed to form the processing segment 51.
  • a green compact can be produced in a first stage, which is further processed into a processing segment in a second stage.
  • FIGN. 5A-C show the green body 52 ( FIG. 5A ), compact 53 ( FIG. 5B ) and the machining segment 51 ( FIG. 5C ).
  • the machining segment 51 is made up of a machining zone 54 and a neutral zone 55 .
  • the neutral zone 55 is required if the processing segment 51 is to be welded to the base body of a processing tool and the combination of matrix material and base body cannot be welded; In the case of weldable combinations of matrix material and base body, the neutral zone 55 can be omitted.
  • the processing zone 54 is made up of a powdery or granular first matrix material 56 and first hard material particles 57, which are arranged according to a defined first particle pattern, and the neutral zone 55 is made up of a powdery or granular second matrix material 59 .
  • matrix material encompasses all materials for the construction of machining segments in which hard material particles can be embedded. Matrix materials can consist of one material or be composed as a mixture of different materials.
  • hard material particles encompasses all cutting means for machining segments; This includes, above all, individual hard material particles, composite parts made up of several hard material particles and coated or encapsulated hard material particles.
  • the machining segment 51 corresponds to the machining segments 11A, 21A, 21B, 31, 41; the machining segment 11B designed as a drill ring differs from the machining segment 51 by its ring-shaped structure.
  • the machining segments can differ from one another in terms of the dimensions and the curvatures of the surfaces. The structure of the machining segments is explained using the machining segment 51 and applies to the machining segments 11A, 21A, 21B, 31, 41.
  • the machining segment 51 comprises the first hard material particles 57, which are arranged in the first matrix material 56.
  • the "first hard material particles” are the hard material particles of the processing segment 51 that process a subsurface, the number of first hard material particles 57 and the defined first particle pattern according to which the first hard material particles 57 are arranged in the first matrix material 56 on the requirements of the processing segment 51 be adjusted.
  • the first hard material particles 57 generally originate from a particle distribution which is characterized by a minimum diameter, a maximum diameter and an average diameter.
  • the machining segment 51 is connected to the base body of the machining tool by an underside 61.
  • the underside of the machining segments is usually flat, whereas the underside of machining segments for sawing is curved so that the machining segments can be attached to the curved face of the ring-shaped or disk-shaped base body.
  • FIG. 5C The machining segment 51 shown, the first hard material particles 57 on an upper side 62 opposite the lower side 61 have a protrusion ⁇ with respect to the first matrix material 56.
  • the green compact 52 is built up in the standing structure from the first matrix material 56, the first hard material particles 57, the second matrix material 59 and a powdery support material 63 .
  • the support material 63 is different from the first matrix material 56 and serves to protect the first hard material particles 57 on the upper side 62.
  • the green compact 52 is compressed under the action of pressure between a first press ram 64, which forms the lower side 61, and a second press ram 65, which forms the upper side 62.
  • the pressing direction of the first press ram 64 and second press ram 65 runs parallel to the direction of construction of the green compact 52.
  • Cold pressing processes or hot pressing processes are suitable as processes which achieve a pressure effect on the green compact 52.
  • the green compact 52 is exposed exclusively to the action of pressure, while in the case of hot pressing processes, in addition to the action of pressure, the green compact 52 is exposed to a temperature of up to temperatures of approx. 200 ° C.
  • the compact 53 is processed further to form the processing segment 51 by free-form sintering or hot pressing.
  • free-form sintering there is a temperature effect on the compact 53 and in the case of hot pressing there is an effect of pressure and temperature.
  • hot pressing there is an effect of pressure and temperature.
  • the properties of the support material 63 determine the behavior of the support material 63 during further processing. If the melting temperature T melt of the support material 63 is lower than the sintering temperature T sinter of the first matrix material 76, the support material 63 changes its powdery or granular state when heated and liquefies before the first matrix material 56 sintered; the liquid support material 63 can distribute itself in the first matrix material 76 during the sintering process and support the sintering process as an infiltrate.
  • the support material 63 remains in its powdery or granular state during heating and can be easily removed from the finished processing segment after the sintering process.
  • FIGN. 6A-D show the production of the green compact 52 by means of the method according to the invention for producing a green compact.
  • the green compact 52 is built up from the first matrix material 56, the first hard material particles 57, the second matrix material 59 and the support material 63.
  • the green body 52 is produced in several steps: In a first step, a second matrix layer 66 of the second matrix material 59 is applied ( FIG. 6A ), wherein the second matrix material 59 can be applied in one layer or in several layers; When producing a green compact for a processing segment without a neutral zone, the application of the second matrix material 59 can be dispensed with. In a second step, a first matrix layer 67 of the first matrix material 56 is applied ( FIG. 6B ), wherein the first matrix material 56 can be applied in one layer or in several layers. In a third step, the first hard material particles 57 are arranged in the first matrix material 56 according to the defined first particle pattern ( FIG.
  • a support layer 68 of the support material 63 is applied to the first matrix layer 67 and the first hard material particles 57 ( FIG. 6D ), wherein the support material 63 can be applied in one layer or in several layers.
  • FIGN. 7A , B show a further processing segment 71 which was produced using the method according to the invention for producing a green compact and the method for further processing the green compact into the processing segment.
  • the machining segment 71 is produced in two stages: In a first stage, a green compact 72 is produced ( FIG. 7A ) and in a second stage the green compact 72 is processed further to form the processing segment 71 ( FIG. 7B ).
  • the machining segment 71 differs from the machining segment 51 of the FIG. 5C in that the processing segment 71 is made up of a processing zone 74 and has no neutral zone.
  • the processing zone 74 is made up of a powdery or granular first matrix material 76, first hard material particles 77, which are arranged according to a defined first particle pattern, and second hard material particles 78 .
  • the second hard material particles 78 were arranged in the first matrix material 76 according to the defined second particle pattern.
  • the second hard material particles 78 can be added to the first matrix material 76 as randomly distributed particles.
  • the first hard material particles 77 and second hard material particles 78 generally originate from particle distributions that are defined by a minimum diameter and a maximum diameter and a mean diameter are characterized.
  • the first hard material particles 77 come from a first particle distribution with a first mean diameter and the second hard material particles 78 from a second particle distribution with a second mean diameter, the first mean diameter being larger than the second mean diameter.
  • the first hard material particles 77 and second hard material particles 78 can originate from the same particle distribution and have the same mean diameter.
  • the machining segment 71 is connected with an underside 81 to the base body of a machining tool.
  • a substrate is processed by first hard material particles 77 which are arranged on an upper side 82 opposite the lower side 81.
  • the in FIG. 7A The green compact 71 shown is built up from the first matrix material 76, the first hard material particles 77, the second hard material particles 83 and a powder or granular support material 83 .
  • the support material 83 is different from the first matrix material 76 and serves to cover the first hard material particles 77 on the upper side 82.
  • the state of the support material 83 is adapted to the state of the first matrix material 76, ie a powdery support material 83 is used for a powdery first matrix material 76 and a granular support material 83 for a granular first matrix material 76.
  • the production of the green compact 71 starts with a sequence of a first and second step, the sequence being carried out once or several times; in the case of the green compact 71 of the FIG. 7A the sequence is performed three times.
  • the first step of the sequence the first matrix material 76 is applied and in the second step of the sequence the second hard material particles 78 are arranged in the first matrix material 76 according to the defined second particle pattern.
  • an upper layer of the first matrix material 76 can be applied in an intermediate step.
  • the first hard material particles 77 are arranged in the first matrix material 76 according to the defined first particle pattern, the first hard material particles 56 not being completely embedded in the first matrix material 76, but rather having a protrusion over the first matrix material 76.
  • the support material 83 is applied, the first hard material particles 77 being completely embedded in the support material 83.
  • the green compact 71 is processed further to form the processing segment 72 by free-form sintering or hot pressing.
  • free-form sintering there is an effect of temperature and in the case of hot pressing there is an effect of pressure and temperature on the green compact 71.
  • the properties of the Support material 83, in particular the melting temperature T melt determine the behavior of the support material 83 during further processing.
  • the support material 83 changes its powdery or granular state when it is heated and liquefies before the first matrix material 76 sintered; the liquid support material 83 can distribute itself in the first matrix material 76 during the sintering process and support the sintering process as an infiltrate. If the melting temperature T melt of the support material 83 is higher than the sintering temperature T sinter of the first matrix material 76, the support material 83 remains in its powdery or granular state during heating and can be easily removed from the finished processing segment after the sintering process.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Powder Metallurgy (AREA)
EP20181947.1A 2020-06-24 2020-06-24 Procédé de fabrication d'une ébauche et procédé de traitement ultérieur de l'ébauche en un segment de traitement Withdrawn EP3928894A1 (fr)

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EP20181947.1A EP3928894A1 (fr) 2020-06-24 2020-06-24 Procédé de fabrication d'une ébauche et procédé de traitement ultérieur de l'ébauche en un segment de traitement

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EP20181947.1A EP3928894A1 (fr) 2020-06-24 2020-06-24 Procédé de fabrication d'une ébauche et procédé de traitement ultérieur de l'ébauche en un segment de traitement

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022127660A1 (de) 2022-10-20 2024-04-25 Schwamborn Gerätebau Gmbh Werkzeugsegment, Schleifwerkzeug und Schleifmaschine

Citations (6)

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Publication number Priority date Publication date Assignee Title
US2143636A (en) * 1935-12-04 1939-01-10 Carborundum Co Abrasive wheel and its manufacture
US5203880A (en) * 1992-07-24 1993-04-20 Tselesin Naum N Method and apparatus for making abrasive tools
EP0754106A1 (fr) * 1994-04-08 1997-01-22 Ultimate Abrasive Systems, L.L.C. Procede pour fabriquer des preformes de poudres et des articles abrasifs a partir de ces preformes
EP2745966A1 (fr) 2012-12-21 2014-06-25 HILTI Aktiengesellschaft Trépan doté d'une section de coupe interchangeable
EP2745965A1 (fr) 2012-12-21 2014-06-25 HILTI Aktiengesellschaft Trépan doté d'une section de coupe interchangeable
EP3670041A1 (fr) 2018-12-21 2020-06-24 Hilti Aktiengesellschaft Procédé de fabrication d'un segment de traitement pour le traitement à sec de matériaux de béton

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2143636A (en) * 1935-12-04 1939-01-10 Carborundum Co Abrasive wheel and its manufacture
US5203880A (en) * 1992-07-24 1993-04-20 Tselesin Naum N Method and apparatus for making abrasive tools
US5203880B1 (en) * 1992-07-24 1995-10-17 Ultimate Abrasive Syst Inc Method and apparatus for making abrasive tools
EP0754106A1 (fr) * 1994-04-08 1997-01-22 Ultimate Abrasive Systems, L.L.C. Procede pour fabriquer des preformes de poudres et des articles abrasifs a partir de ces preformes
EP2745966A1 (fr) 2012-12-21 2014-06-25 HILTI Aktiengesellschaft Trépan doté d'une section de coupe interchangeable
EP2745965A1 (fr) 2012-12-21 2014-06-25 HILTI Aktiengesellschaft Trépan doté d'une section de coupe interchangeable
EP3670041A1 (fr) 2018-12-21 2020-06-24 Hilti Aktiengesellschaft Procédé de fabrication d'un segment de traitement pour le traitement à sec de matériaux de béton

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102022127660A1 (de) 2022-10-20 2024-04-25 Schwamborn Gerätebau Gmbh Werkzeugsegment, Schleifwerkzeug und Schleifmaschine
EP4368343A1 (fr) 2022-10-20 2024-05-15 Schwamborn Geraetebau GmbH Segment d'outil, outil de meulage, module d'outil de meulage et machine de meulage

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